USGS/SLU Regional Moment Solution
13/04/07 09:34:38.00 Epicenter: 66.224 -148.746 MW 3.7 USGS/SLU REGIONAL MOMENT TENSOR Depth 15 No. of sta: 17 Moment Tensor; Scale 10**14 Nm Mrr=-3.28 Mtt=-0.51 Mpp= 3.78 Mrt=-0.71 Mrp=-1.06 Mtp=-1.77 Principal axes: T Val= 4.50 Plg= 6 Azm= 71 N -0.75 21 163 P -3.75 68 327 Best Double Couple:Mo=4.2*10**14 NP1:Strike=139 Dip=43 Slip=-122 NP2: 360 54 -64
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.